Battery madness continues!
Had my own, private version of TV comedy show: in the small hrs of the morning I was trying to figure out where the infuriating sharp repetitive sound is coming from. You should see me: alert, attentive, migrating from one room to another, turning TV off/on, opening the oven, even going out into the hallway and listening at neighbor’s wall. I was a proper J.F.Cooper’s scout on a hunting path.
Then followed the real comedy gold. Try to turn off smoke detector at 1:30am when you don’t know how it is constructed and there is no light near the spot where it hangs.
Apparently, 1 beep every half-second means the battery is dead! Good to know, thanks for the lesson and another one – for a p.4 font at the back of the evil device, now die, [expletive deleted] die!